Chinese Study Models 935 Airborne Jammers to Disrupt Starlink Across Taiwan

A simulation puts the scale of disruption at hundreds of aircraft

Chinese defense researchers have modeled a force of at least 935 synchronized airborne jammers to suppress Starlink signals across an area the size of Taiwan. With lower power transmitters, the requirement rises to roughly 2,000 platforms. The proposed force would use drones, balloons or aircraft to interfere with the satellite connections that people on the ground depend on.

The study, published in Systems Engineering and Electronics by a team including researchers from Beijing Institute of Technology and Zhejiang University, examined coverage over roughly 36,000 square kilometers. Its simulation followed satellite passes and terminal visibility over a 12 hour window, testing whether interference could prevent users from maintaining a connection as satellites moved overhead.

The central finding is that widespread suppression may be technically feasible, but achieving it would require a very large, coordinated electronic warfare force. Electronic warfare here means using radio transmissions to interfere with another system's signals. The researchers describe a network that keeps changing its connections, making it difficult for an attacker to sustain disruption.

As of November 24, 2025, the account describes Starlink as operating with more than ten thousand satellites in low Earth orbit. Ground terminals continually switch between those moving satellites. Frequencies, signal paths and traffic routes can change, allowing the network to work around disruptions.

The authors caution that their findings are preliminary. Important details of Starlink's protection against jamming are not public, and the performance of a force in combat would depend on terrain, weather, losses and adaptation by both sides. The simulation nevertheless sets out the scale of the challenge: blocking a large, moving constellation over an entire island requires persistent coverage, with few opportunities for a terminal to reconnect.

Why Ukraine brought Starlink into focus

Russian attempts to interfere with Starlink during the war in Ukraine helped shape the Chinese researchers' interest. SpaceX repeatedly changed software and network settings to keep terminals connected. The resilience of those links helped Ukraine preserve command and control during the opening months of the invasion, drawing close attention in Beijing.

Command and control is the ability to send instructions, share information and coordinate forces. When ordinary communications are disrupted, a working satellite connection can preserve that flow. The experience in Ukraine showed why a military studying a possible Taiwan conflict would examine ways to interrupt Starlink service.

SpaceX's ability to update its network also makes the problem change over time. An interference method that works at the beginning of an engagement could become less effective after terminals or network settings are adjusted. The attacker would have to respond while continuing to maintain coverage.

Taiwan's communication planning therefore involves more than whether a satellite network can operate above the island. It also involves whether connections can survive deliberate interference, whether terminals have power and whether essential traffic can move to another system when one connection becomes unreliable.

Moving satellites leave little time to react

Older communication satellites often operate in geostationary orbit, appearing fixed over the equator. A jammer can direct interference toward a known point in the sky or try to overpower a satellite's signal across a particular coverage area. Conventional jamming from the ground is better suited to that relatively stable arrangement.

Starlink satellites operate at low altitude and move rapidly across the sky. The satellites visible from a particular location change every few minutes, and dozens can be in view at once. A terminal seldom communicates with the same satellite for long, instead transferring its connection as satellites rise and disappear over the horizon.

Those transfers, known as handoffs, complicate an attack. A jammer must react to changes in direction, frequency and timing. Interference that blocks one connection may leave the next connection available seconds later. Even a short delay in responding can allow a user to regain service.

Starlink also changes the routes used to carry traffic. Suppressing a connection therefore involves keeping signal quality below a usable level through repeated changes, rather than overpowering a single fixed link. A few large transmitters on the ground offer little assurance of maintaining that pressure across the whole island.

Directional beams and optical links complicate interference

Starlink terminals and satellites use directional antennas and adaptable radio signals. Their phased array antennas steer beams electronically, focusing energy toward a chosen direction without needing to turn the entire antenna. That focus can help a receiver reject interference arriving from outside its main beam.

The network can also change channels and adjust coding schemes, which determine how information is packaged for transmission. Those adjustments can help maintain a usable connection when signal conditions deteriorate. Frequency agility means the radio connection can change frequencies, giving an attacker another moving target to follow.

Many Starlink satellites pass traffic between one another through optical crosslinks. These links use light rather than radio transmissions, reducing the number of radio connections that a jammer can attack. The network can also change routing through those links to move traffic away from contested radio segments.

The ground terminal still needs a usable connection to a satellite. The Chinese model targets that part of the system: the downlink, or signal traveling from the satellite to the user. Sustained suppression would require enough interference at terminals across varied terrain, even while the network changes satellites, frequencies and routes.

How the proposed airborne network would work

The researchers proposed distributing smaller jammers across many airborne platforms instead of relying on a handful of large transmitters on the ground. Each platform would act as a node emitting noise intended to overwhelm Starlink's downlink at a user terminal.

Airborne positioning would bring the interference source closer to terminals and reduce signal losses caused by terrain and buildings. Drones, balloons or aircraft could also change position as coverage needs changed. Coordinated power levels, antenna patterns and timing would create what the study describes as an electromagnetic barrier across the target area.

A swarm could move to fill holes in coverage, strengthen interference in weak areas or concentrate on emerging hotspots. That flexibility comes with a demanding coordination task. Nodes would need precise timing and positioning to avoid interfering with one another or leaving places where users could regain a connection.

The swarm would also need reliable command and control of its own. Losing coordination could open gaps quickly, especially while satellites continued moving and terminals searched for usable links. Maintaining the interference layer would therefore depend on keeping both the jammers and the system directing them operational.

Why lower power means more platforms

The simulation compared different antenna choices. A wide beam spreads interference over a larger area, but delivers less energy in any particular direction. A narrow beam concentrates more energy on a target, while requiring more accurate pointing. The choice affects both the strength of interference and the area each platform can cover.

The baseline calculation required at least 935 synchronized airborne platforms to maintain suppression across the island. With lower power emitters radiating around 23 dBW per platform, equivalent to about 200 watts, the requirement rose to roughly 2,000 units. The model accounted for changing satellite visibility and the continuing handoffs between satellites.

The lower power scenario therefore required more than twice the baseline number of platforms: approximately 2,000 compared with 935. The tradeoff is straightforward. If each transmitter contributes less interference, more transmitters are needed to close coverage gaps and maintain similar effects.

The calculations concern sustained coverage over an area comparable to Taiwan, rather than a brief interruption at one location. That scope explains why the numbers are so large. A terminal able to find a usable satellite connection through a gap could resume service, requiring the attacking force to maintain its coverage as the sky above it changed.

Keeping a thousand jammers airborne would be demanding

The People's Liberation Army would need large inventories of expendable drones or aircraft capable of surviving the operation to field a force on this scale. Trained operators and an automated coordination system would have to manage movement, timing and radio spectrum use across hundreds or thousands of platforms.

Battery life, fuel supplies and weather would affect how long each platform could stay in position. A stable formation would have to continue operating through those constraints and through losses. Spare platforms would be needed to replace aircraft that were brought down and to prevent interruptions in coverage.

Taiwan and supporting forces would contest the airspace with radar, missiles fired from the ground, weapons targeting drones and their own electronic warfare. A large jamming layer moving slowly across the island would invite interception. Replacing losses would become part of the continuing operation.

Altitude creates another tradeoff. Higher flight improves the direct signal path to terminals and reduces obstruction by terrain, but exposes platforms to air defenses with longer range. Lower flight can offer concealment behind hills and buildings, while increasing coverage gaps and the number of platforms needed.

The attacking force would also have to coordinate frequencies and waveforms while protecting its own communications. Thousands of emitters operating in congested radio spectrum could interfere with friendly systems or one another. Managing those competing demands under fire would add to the burden of keeping the swarm connected.

Defenders could change the conditions during an attack

Taiwan and its partners could seek to harden terminals, narrow their receiving beams and improve filters that reject unwanted signals. They could also change frequencies, use techniques designed to make transmissions harder to detect or adjust modem settings to maintain connections at lower signal quality.

SpaceX can distribute software updates rapidly, as its response to interference in Ukraine showed. Those updates could change the conditions facing an attacking force during an operation. A jamming plan that performs well in an early engagement might lose effectiveness as the network adapts.

Military grade variants and services also exist, while terminals differ in capability. Many terminals can receive highly directional beams that reject interference arriving from unwanted angles. The company continues to add satellites and update software, changing the network that an attacker must contend with.

The simulation depends on assumptions about signal strength, the density of terminals and how the defender behaves. Combat adds changing terrain conditions, weather, losses and rapid responses by both sides. As the constellation grows and its software develops, the attacker may have to expand its force simply to maintain the same degree of pressure.

Taiwan's resilience depends on several routes

Analysts have urged Taiwan to build communications redundancy across space, air and ground. Redundancy means keeping more than one working route available, so that essential messages can move elsewhere when a connection fails. Buying access to several satellite networks is one part of that approach; equipment, power and trained operators are also necessary.

Terminals would need to be positioned before a crisis, and operators would need practice switching between systems. Independent radio networks could carry essential traffic when capacity is limited. The planning recommendations include:

• Secure access to multiple satellite providers, including systems in low Earth orbit and medium Earth orbit, with contracts and equipment arranged in advance.
• Distribute terminals among agencies, utilities and emergency responders, storing power supplies, camouflage materials and spare parts in several locations.
• Protect antenna sites, use directional antennas and control emissions to reduce the chance of detection.
• Maintain alternative connections through high frequency radio, satellite phones, microwave relays and portable mesh networks that can bridge short distances.
• Use aerial relays, including tethered balloons or aircraft, to restore local connectivity when ground networks are damaged.
• Practice switching between networks during peacetime, including public communication drills and continuity plans for critical services.
• Work with partners to secure extra capacity on allied networks and coordinate efforts to reduce interference.

Several communication routes make an attack more difficult because traffic can move when one route degrades. Reliable power, disciplined terminal use and trained operators can help preserve essential services even when the amount of data that networks can carry becomes scarce.

Other research considers physically disabling satellites

Some Chinese research has also explored physically disabling parts of a large constellation. The concepts include using artificial intelligence to coordinate targeting by satellites equipped with directed energy or other systems. Directed energy means concentrating energy on a target, rather than striking it with a conventional projectile.

These studies examine how a smaller attacking force might disrupt service by identifying key satellites, particularly nodes carrying the most traffic. The concepts remain theoretical and face enormous engineering, legal and strategic constraints.

Damaging satellites can create debris that threatens spacecraft belonging to many countries. International norms discourage kinetic attacks against satellites for that reason. Debris can leave a lasting hazard, extending the consequences beyond the spacecraft originally targeted.

Directed energy concepts avoid debris, but require substantial power, precise pointing and favorable positioning between the attacking system and its target. Pursuing physical attacks would sharply raise tensions and could draw wider responses. Jamming is also escalatory, but it is reversible and does not leave persistent debris.

The two approaches place different demands on an attacker. The airborne proposal focuses on overwhelming connections at ground terminals across a large area. Physical disruption concepts focus on removing or disabling selected parts of the constellation. Both face the challenge of a large network whose connections and traffic routes keep changing.

What to Know

• A Chinese study published in Systems Engineering and Electronics modeled Starlink suppression over roughly 36,000 square kilometers, an area comparable to Taiwan.
• The team included researchers from Beijing Institute of Technology and Zhejiang University and simulated satellite visibility over 12 hours.
• The baseline required at least 935 synchronized airborne jammers, rising to roughly 2,000 with emitters radiating about 200 watts each.
• Drones, balloons or aircraft would target satellite downlinks at user terminals while maintaining coverage through changing satellite connections.
• Moving satellites, directional antennas, frequency changes, optical crosslinks and software updates complicate sustained interference.
• Air defenses, weather, endurance, replacement platforms and coordination would affect whether such a force could operate in combat.
• Taiwan can improve resilience through multiple satellite providers, alternative radio networks, protected equipment, reliable power and practiced switching procedures.
• The authors describe their findings as preliminary. Other Chinese concepts involving physical attacks on satellites remain theoretical.